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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '897230d57c0ff292fbf387ced47ae889d9c2ef405a5fe45da9ddbedaaed5cee7' 
  AND token = '9Aa1yTGzjVcPT/EiSqzTBCPj0Baokt7pa54lBDtU17U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}